Fixed compiler warning

ac662b84 · Sam Lantinga · 924f55ee · ac662b84
Commit ac662b84 authored Mar 07, 2011 by Sam Lantinga
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SDL_string.c src/stdlib/SDL_string.c +2 -2

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--- a/src/stdlib/SDL_string.c
+++ b/src/stdlib/SDL_string.c
@@ -865,8 +865,8 @@ SDL_strncasecmp(const char *str1, const char *str2, size_t maxlen)
        ++str2;
        --maxlen;
    }
-    a = SDL_tolower(*str1);
-    b = SDL_tolower(*str2);
+    a = SDL_tolower((unsigned char) *str1);
+    b = SDL_tolower((unsigned char) *str2);
    return (int) ((unsigned char) a - (unsigned char) b);
 }
 #endif