Remove printf call from interrupt context

LMESTM · LMESTM · commit 40e12dc23c80 · 2017-02-16T08:34:42.000+01:00
With ARM compiler at least, if we enable DEBUG, the InterruptIn will fail
in timeout as the program would crash calling printf in the cbfn as this
happens in Interrupt context. Let's remove it
diff --git a/TESTS/API/InterruptIn/InterruptIn.cpp b/TESTS/API/InterruptIn/InterruptIn.cpp
@@ -33,7 +33,6 @@ volatile bool result = false;
 void cbfn(void)
 {
     result = true;
-    DEBUG_PRINTF("\t**** Interrupt Triggered!\n");
 }
 
 // Template to check Falling edge and Rising edge interrupts.

Original file line number	Diff line number	Diff line change
`@@ -33,7 +33,6 @@ volatile bool result = false;`
`33`	`33`	`void cbfn(void)`
`34`	`34`	`{`
`35`	`35`	`result = true;`
`36`		`- DEBUG_PRINTF("\t**** Interrupt Triggered!\n");`
`37`	`36`	`}`
`38`	`37`
`39`	`38`	`// Template to check Falling edge and Rising edge interrupts.`