diff --git a/common/av_common.c b/common/av_common.c
index 805ea4bed2..b3ca3d3c85 100644
--- a/common/av_common.c
+++ b/common/av_common.c
@@ -340,7 +340,7 @@ static void resolve_positional_arg(void *avobj, char **name)
 
     char *end = NULL;
     int pos = strtol(*name + 1, &end, 10);
-    if (!end || *end || pos < 0)
+    if (*end || pos < 0)
         return;
 
     const AVOption *opt = NULL;
diff --git a/demux/demux.c b/demux/demux.c
index 3263f3f0c6..ca8e0909d6 100644
--- a/demux/demux.c
+++ b/demux/demux.c
@@ -2869,7 +2869,7 @@ static int decode_float(char *str, float *out)
     float dec_val;
 
     dec_val = strtod(str, &rest);
-    if (!rest || (rest == str) || !isfinite(dec_val))
+    if (rest == str || !isfinite(dec_val))
         return -1;
 
     *out = dec_val;
diff --git a/demux/demux_lavf.c b/demux/demux_lavf.c
index 4ce8085a43..25659be260 100644
--- a/demux/demux_lavf.c
+++ b/demux/demux_lavf.c
@@ -660,7 +660,7 @@ static int dict_get_decimal(AVDictionary *dict, const char *entry, int def)
     if (e && e->value) {
         char *end = NULL;
         long int r = strtol(e->value, &end, 10);
-        if (end && !end[0] && r >= INT_MIN && r <= INT_MAX)
+        if (!end[0] && r >= INT_MIN && r <= INT_MAX)
             return r;
     }
     return def;
diff --git a/demux/demux_mkv.c b/demux/demux_mkv.c
index e9c0ddbdfb..acbd75f6d9 100644
--- a/demux/demux_mkv.c
+++ b/demux/demux_mkv.c
@@ -1839,7 +1839,7 @@ static void parse_vorbis_chmap(struct mp_chmap *channels, unsigned char *data,
             snprintf(smask, sizeof(smask), "%.*s", (int)(len - 34), data + 34);
             char *end = NULL;
             uint32_t mask = strtol(smask, &end, 0);
-            if (!end || end[0])
+            if (end[0])
                 mask = 0;
             struct mp_chmap chmask = {0};
             mp_chmap_from_waveext(&chmask, mask);
diff --git a/options/m_option.c b/options/m_option.c
index e544bc929d..25c17ab0a6 100644
--- a/options/m_option.c
+++ b/options/m_option.c
@@ -786,7 +786,7 @@ static int choice_get(const m_option_t *opt, void *ta_parent,
     if (alt) {
         char *end = NULL;
         ival = strtol(alt->name, &end, 10);
-        if (end && !end[0])
+        if (!end[0])
             alt = NULL;
     }
     if (alt) {
diff --git a/stream/stream_file.c b/stream/stream_file.c
index c7540a8a5f..441c5fd469 100644
--- a/stream/stream_file.c
+++ b/stream/stream_file.c
@@ -300,7 +300,7 @@ static int open_f(stream_t *stream, const struct stream_open_args *args)
         stream->is_local_fs = false;
         char *begin = strstr(stream->url, "://") + 3, *end = NULL;
         p->fd = strtol(begin, &end, 0);
-        if (!end || end == begin || end[0] || p->fd < 0) {
+        if (end == begin || end[0] || p->fd < 0) {
             MP_ERR(stream, "Invalid FD number: %s\n", stream->url);
             return STREAM_ERROR;
         }